diff options
25 files changed, 101 insertions, 0 deletions
diff --git a/include/asm-alpha/scatterlist.h b/include/asm-alpha/scatterlist.h index b7647063bd5..440747ca634 100644 --- a/include/asm-alpha/scatterlist.h +++ b/include/asm-alpha/scatterlist.h @@ -5,6 +5,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; diff --git a/include/asm-arm/scatterlist.h b/include/asm-arm/scatterlist.h index ab1d85dd023..ca0a37d0340 100644 --- a/include/asm-arm/scatterlist.h +++ b/include/asm-arm/scatterlist.h @@ -5,6 +5,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; /* buffer offset */ dma_addr_t dma_address; /* dma address */ diff --git a/include/asm-avr32/scatterlist.h b/include/asm-avr32/scatterlist.h index 1356f29d89f..377320e3bd1 100644 --- a/include/asm-avr32/scatterlist.h +++ b/include/asm-avr32/scatterlist.h @@ -4,6 +4,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; dma_addr_t dma_address; diff --git a/include/asm-blackfin/scatterlist.h b/include/asm-blackfin/scatterlist.h index 384af549e5b..32128d53469 100644 --- a/include/asm-blackfin/scatterlist.h +++ b/include/asm-blackfin/scatterlist.h @@ -4,6 +4,9 @@ #include <linux/mm.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; dma_addr_t dma_address; diff --git a/include/asm-cris/scatterlist.h b/include/asm-cris/scatterlist.h index 5a8a83440d3..faff53ad1f9 100644 --- a/include/asm-cris/scatterlist.h +++ b/include/asm-cris/scatterlist.h @@ -2,6 +2,9 @@ #define __ASM_CRIS_SCATTERLIST_H struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif char * address; /* Location data is to be transferred to */ unsigned int length; diff --git a/include/asm-frv/scatterlist.h b/include/asm-frv/scatterlist.h index 53dade7b2e1..f7da007b763 100644 --- a/include/asm-frv/scatterlist.h +++ b/include/asm-frv/scatterlist.h @@ -22,6 +22,9 @@ * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens */ struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; /* for highmem, page offset */ diff --git a/include/asm-h8300/scatterlist.h b/include/asm-h8300/scatterlist.h index 7e41983d6b2..d3ecdd87ac9 100644 --- a/include/asm-h8300/scatterlist.h +++ b/include/asm-h8300/scatterlist.h @@ -4,6 +4,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; dma_addr_t dma_address; diff --git a/include/asm-ia64/scatterlist.h b/include/asm-ia64/scatterlist.h index 2f76ce30496..d6f57874041 100644 --- a/include/asm-ia64/scatterlist.h +++ b/include/asm-ia64/scatterlist.h @@ -9,6 +9,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; unsigned int length; /* buffer length */ diff --git a/include/asm-m32r/scatterlist.h b/include/asm-m32r/scatterlist.h index 33b4b4d2c89..1ed372c73d0 100644 --- a/include/asm-m32r/scatterlist.h +++ b/include/asm-m32r/scatterlist.h @@ -4,6 +4,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif char * address; /* Location data is to be transferred to, NULL for * highmem page */ unsigned long page_link; diff --git a/include/asm-m68k/scatterlist.h b/include/asm-m68k/scatterlist.h index e06bb891048..d3a7a0edfec 100644 --- a/include/asm-m68k/scatterlist.h +++ b/include/asm-m68k/scatterlist.h @@ -4,6 +4,9 @@ #include <linux/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; unsigned int length; diff --git a/include/asm-m68knommu/scatterlist.h b/include/asm-m68knommu/scatterlist.h index 28bed41dc80..10942840e88 100644 --- a/include/asm-m68knommu/scatterlist.h +++ b/include/asm-m68knommu/scatterlist.h @@ -5,6 +5,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; dma_addr_t dma_address; diff --git a/include/asm-mips/scatterlist.h b/include/asm-mips/scatterlist.h index 787797cdb0a..83d69fe17c9 100644 --- a/include/asm-mips/scatterlist.h +++ b/include/asm-mips/scatterlist.h @@ -4,6 +4,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; dma_addr_t dma_address; diff --git a/include/asm-parisc/scatterlist.h b/include/asm-parisc/scatterlist.h index 26da9146fff..cd3cfdf8228 100644 --- a/include/asm-parisc/scatterlist.h +++ b/include/asm-parisc/scatterlist.h @@ -5,6 +5,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; diff --git a/include/asm-powerpc/scatterlist.h b/include/asm-powerpc/scatterlist.h index b9f1dbc2484..fcf7d55afe4 100644 --- a/include/asm-powerpc/scatterlist.h +++ b/include/asm-powerpc/scatterlist.h @@ -14,6 +14,9 @@ #include <asm/dma.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; unsigned int length; diff --git a/include/asm-s390/scatterlist.h b/include/asm-s390/scatterlist.h index eb3948690d6..29ec8e28c8d 100644 --- a/include/asm-s390/scatterlist.h +++ b/include/asm-s390/scatterlist.h @@ -2,6 +2,9 @@ #define _ASMS390_SCATTERLIST_H struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; unsigned int length; diff --git a/include/asm-sh/scatterlist.h b/include/asm-sh/scatterlist.h index bc7c809e16f..a7d0d1856a9 100644 --- a/include/asm-sh/scatterlist.h +++ b/include/asm-sh/scatterlist.h @@ -4,6 +4,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset;/* for highmem, page offset */ dma_addr_t dma_address; diff --git a/include/asm-sh64/scatterlist.h b/include/asm-sh64/scatterlist.h index 0afd856e218..5109251970e 100644 --- a/include/asm-sh64/scatterlist.h +++ b/include/asm-sh64/scatterlist.h @@ -14,6 +14,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset;/* for highmem, page offset */ dma_addr_t dma_address; diff --git a/include/asm-sparc/scatterlist.h b/include/asm-sparc/scatterlist.h index 45b16f1072b..e08d3d775b0 100644 --- a/include/asm-sparc/scatterlist.h +++ b/include/asm-sparc/scatterlist.h @@ -5,6 +5,9 @@ #include <linux/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; diff --git a/include/asm-sparc64/scatterlist.h b/include/asm-sparc64/scatterlist.h index 4cbaf7c6b0b..6df23f070b1 100644 --- a/include/asm-sparc64/scatterlist.h +++ b/include/asm-sparc64/scatterlist.h @@ -6,6 +6,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; diff --git a/include/asm-v850/scatterlist.h b/include/asm-v850/scatterlist.h index db91febc210..02d27b3fb06 100644 --- a/include/asm-v850/scatterlist.h +++ b/include/asm-v850/scatterlist.h @@ -17,6 +17,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned offset; dma_addr_t dma_address; diff --git a/include/asm-x86/scatterlist_32.h b/include/asm-x86/scatterlist_32.h index 140a5b37fa7..0e7d997a34b 100644 --- a/include/asm-x86/scatterlist_32.h +++ b/include/asm-x86/scatterlist_32.h @@ -4,6 +4,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; dma_addr_t dma_address; diff --git a/include/asm-x86/scatterlist_64.h b/include/asm-x86/scatterlist_64.h index e3447846e03..1847c72befe 100644 --- a/include/asm-x86/scatterlist_64.h +++ b/include/asm-x86/scatterlist_64.h @@ -4,6 +4,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; unsigned int length; diff --git a/include/asm-xtensa/scatterlist.h b/include/asm-xtensa/scatterlist.h index 3b8aba5d2c6..810080bb0a2 100644 --- a/include/asm-xtensa/scatterlist.h +++ b/include/asm-xtensa/scatterlist.h @@ -14,6 +14,9 @@ #include <asm/types.h> struct scatterlist { +#ifdef CONFIG_DEBUG_SG + unsigned long sg_magic; +#endif unsigned long page_link; unsigned int offset; dma_addr_t dma_address; diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index c6136e8a7f5..42daf5e1526 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -23,6 +23,8 @@ * */ +#define SG_MAGIC 0x87654321 + /** * sg_set_page - Set sg entry to point at given page * @sg: SG entry @@ -39,6 +41,9 @@ static inline void sg_set_page(struct scatterlist *sg, struct page *page) { unsigned long page_link = sg->page_link & 0x3; +#ifdef CONFIG_DEBUG_SG + BUG_ON(sg->sg_magic != SG_MAGIC); +#endif sg->page_link = page_link | (unsigned long) page; } @@ -81,6 +86,9 @@ static inline void sg_set_buf(struct scatterlist *sg, const void *buf, **/ static inline struct scatterlist *sg_next(struct scatterlist *sg) { +#ifdef CONFIG_DEBUG_SG + BUG_ON(sg->sg_magic != SG_MAGIC); +#endif if (sg_is_last(sg)) return NULL; @@ -124,6 +132,10 @@ static inline struct scatterlist *sg_last(struct scatterlist *sgl, ret = sg; #endif +#ifdef CONFIG_DEBUG_SG + BUG_ON(sgl[0].sg_magic != SG_MAGIC); + BUG_ON(!sg_is_last(ret)); +#endif return ret; } @@ -180,6 +192,9 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf, unsigned int buflen) { memset(sg, 0, sizeof(*sg)); +#ifdef CONFIG_DEBUG_SG + sg->sg_magic = SG_MAGIC; +#endif sg_mark_end(sg, 1); sg_set_buf(sg, buf, buflen); } @@ -198,6 +213,13 @@ static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents) { memset(sgl, 0, sizeof(*sgl) * nents); sg_mark_end(sgl, nents); +#ifdef CONFIG_DEBUG_SG + { + int i; + for (i = 0; i < nents; i++) + sgl[i].sg_magic = SG_MAGIC; + } +#endif } /** diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index c567f219191..1faa5087dc8 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -389,6 +389,16 @@ config DEBUG_LIST If unsure, say N. +config DEBUG_SG + bool "Debug SG table operations" + depends on DEBUG_KERNEL + help + Enable this to turn on checks on scatter-gather tables. This can + help find problems with drivers that do not properly initialize + their sg tables. + + If unsure, say N. + config FRAME_POINTER bool "Compile the kernel with frame pointers" depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || AVR32 || SUPERH || BFIN) |