diff options
| -rw-r--r-- | arch/s390/kernel/cpcmd.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c index a5972f1541f..6c89f30c8e3 100644 --- a/arch/s390/kernel/cpcmd.c +++ b/arch/s390/kernel/cpcmd.c @@ -16,6 +16,7 @@ #include <asm/ebcdic.h> #include <asm/cpcmd.h> #include <asm/system.h> +#include <asm/io.h> static DEFINE_SPINLOCK(cpcmd_lock); static char cpcmd_buf[241]; @@ -88,13 +89,8 @@ int cpcmd(const char *cmd, char *response, int rlen, int *response_code) int len; unsigned long flags; - if ((rlen == 0) || (response == NULL) - || !((unsigned long)response >> 31)) { - spin_lock_irqsave(&cpcmd_lock, flags); - len = __cpcmd(cmd, response, rlen, response_code); - spin_unlock_irqrestore(&cpcmd_lock, flags); - } - else { + if ((virt_to_phys(response) != (unsigned long) response) || + (((unsigned long)response + rlen) >> 31)) { lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA); if (!lowbuf) { printk(KERN_WARNING @@ -106,6 +102,10 @@ int cpcmd(const char *cmd, char *response, int rlen, int *response_code) spin_unlock_irqrestore(&cpcmd_lock, flags); memcpy(response, lowbuf, rlen); kfree(lowbuf); + } else { + spin_lock_irqsave(&cpcmd_lock, flags); + len = __cpcmd(cmd, response, rlen, response_code); + spin_unlock_irqrestore(&cpcmd_lock, flags); } return len; } |