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scsi: sr: Have midlayer retry get_sectorsize() errors

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This has get_sectorsize() have the SCSI midlayer retry errors instead of
driving them itself.

There is one behavior change where we no longer retry when
scsi_execute_cmd() returns < 0, but we should be ok. We don't need to retry
for failures like the queue being removed, and for the case where there are
no tags/reqs the block layer waits/retries for us. For possible memory
allocation failures from blk_rq_map_kern() we use GFP_NOIO, so retrying
will probably not help.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20240123002220.129141-18-michael.christie@oracle.com
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2024-01-22 18:22:18 -06:00 committed by Martin K. Petersen
parent 3a7b457932
commit b72f2d149e
1 changed files with 20 additions and 18 deletions
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38
drivers/scsi/sr.c
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@ -717,27 +717,29 @@ fail:
static void get_sectorsize(struct scsi_cd *cd)
{
unsigned char cmd[10];
unsigned char buffer[8];
int the_result, retries = 3;
static const u8 cmd[10] = { READ_CAPACITY };
unsigned char buffer[8] = { };
int the_result;
int sector_size;
struct request_queue *queue;
struct scsi_failure failure_defs[] = {
{
.result = SCMD_FAILURE_RESULT_ANY,
.allowed = 3,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.failures = &failures,
};
do {
cmd[0] = READ_CAPACITY;
memset((void *) &cmd[1], 0, 9);
memset(buffer, 0, sizeof(buffer));
/* Do the command and wait.. */
the_result = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN,
buffer, sizeof(buffer),
SR_TIMEOUT, MAX_RETRIES, NULL);
retries--;
} while (the_result && retries);
/* Do the command and wait.. */
the_result = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer,
sizeof(buffer), SR_TIMEOUT, MAX_RETRIES,
&exec_args);
if (the_result) {
cd->capacity = 0x1fffff;
sector_size = 2048; /* A guess, just in case */