diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/scsi_transport_spi.c | 49 |
1 files changed, 34 insertions, 15 deletions
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c index 303d7656f71..28966d05435 100644 --- a/drivers/scsi/scsi_transport_spi.c +++ b/drivers/scsi/scsi_transport_spi.c @@ -22,6 +22,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/workqueue.h> +#include <linux/blkdev.h> #include <asm/semaphore.h> #include <scsi/scsi.h> #include "scsi_priv.h" @@ -41,6 +42,11 @@ #define SPI_MAX_ECHO_BUFFER_SIZE 4096 +#define DV_LOOPS 3 +#define DV_TIMEOUT (10*HZ) +#define DV_RETRIES 3 /* should only need at most + * two cc/ua clears */ + /* Private data accessors (keep these out of the header file) */ #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending) #define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem) @@ -100,6 +106,29 @@ static int sprint_frac(char *dest, int value, int denom) return result; } +/* Modification of scsi_wait_req that will clear UNIT ATTENTION conditions + * resulting from (likely) bus and device resets */ +static void spi_wait_req(struct scsi_request *sreq, const void *cmd, + void *buffer, unsigned bufflen) +{ + int i; + + for(i = 0; i < DV_RETRIES; i++) { + sreq->sr_request->flags |= REQ_FAILFAST; + + scsi_wait_req(sreq, cmd, buffer, bufflen, + DV_TIMEOUT, /* retries */ 1); + if (sreq->sr_result & DRIVER_SENSE) { + struct scsi_sense_hdr sshdr; + + if (scsi_request_normalize_sense(sreq, &sshdr) + && sshdr.sense_key == UNIT_ATTENTION) + continue; + } + break; + } +} + static struct { enum spi_signal_type value; char *name; @@ -378,11 +407,6 @@ static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR, if(i->f->set_##x) \ i->f->set_##x(sdev->sdev_target, y) -#define DV_LOOPS 3 -#define DV_TIMEOUT (10*HZ) -#define DV_RETRIES 3 /* should only need at most - * two cc/ua clears */ - enum spi_compare_returns { SPI_COMPARE_SUCCESS, SPI_COMPARE_FAILURE, @@ -446,8 +470,7 @@ spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer, for (r = 0; r < retries; r++) { sreq->sr_cmd_len = 0; /* wait_req to fill in */ sreq->sr_data_direction = DMA_TO_DEVICE; - scsi_wait_req(sreq, spi_write_buffer, buffer, len, - DV_TIMEOUT, DV_RETRIES); + spi_wait_req(sreq, spi_write_buffer, buffer, len); if(sreq->sr_result || !scsi_device_online(sdev)) { struct scsi_sense_hdr sshdr; @@ -471,8 +494,7 @@ spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer, memset(ptr, 0, len); sreq->sr_cmd_len = 0; /* wait_req to fill in */ sreq->sr_data_direction = DMA_FROM_DEVICE; - scsi_wait_req(sreq, spi_read_buffer, ptr, len, - DV_TIMEOUT, DV_RETRIES); + spi_wait_req(sreq, spi_read_buffer, ptr, len); scsi_device_set_state(sdev, SDEV_QUIESCE); if (memcmp(buffer, ptr, len) != 0) @@ -500,8 +522,7 @@ spi_dv_device_compare_inquiry(struct scsi_request *sreq, u8 *buffer, memset(ptr, 0, len); - scsi_wait_req(sreq, spi_inquiry, ptr, len, - DV_TIMEOUT, DV_RETRIES); + spi_wait_req(sreq, spi_inquiry, ptr, len); if(sreq->sr_result || !scsi_device_online(sdev)) { scsi_device_set_state(sdev, SDEV_QUIESCE); @@ -593,8 +614,7 @@ spi_dv_device_get_echo_buffer(struct scsi_request *sreq, u8 *buffer) * (reservation conflict, device not ready, etc) just * skip the write tests */ for (l = 0; ; l++) { - scsi_wait_req(sreq, spi_test_unit_ready, NULL, 0, - DV_TIMEOUT, DV_RETRIES); + spi_wait_req(sreq, spi_test_unit_ready, NULL, 0); if(sreq->sr_result) { if(l >= 3) @@ -608,8 +628,7 @@ spi_dv_device_get_echo_buffer(struct scsi_request *sreq, u8 *buffer) sreq->sr_cmd_len = 0; sreq->sr_data_direction = DMA_FROM_DEVICE; - scsi_wait_req(sreq, spi_read_buffer_descriptor, buffer, 4, - DV_TIMEOUT, DV_RETRIES); + spi_wait_req(sreq, spi_read_buffer_descriptor, buffer, 4); if (sreq->sr_result) /* Device has no echo buffer */ |