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scsi: lib/sg_pool.c: clear 'first_chunk' in case of no preallocation

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If user doesn't ask to preallocate by passing zero 'nents_first_chunk' to
sg_alloc_table_chained, we need to make sure that 'first_chunk' is cleared.
Otherwise, __sg_alloc_table() still may think that the 1st SGL should be
from the preallocation.

Fixes the issue by clearing 'first_chunk' in sg_alloc_table_chained() if
'nents_first_chunk' is zero.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ming Lei 2019-06-06 16:34:08 +08:00 committed by Martin K. Petersen
parent 3dccdf53c2
commit b79d9a09ae
1 changed files with 4 additions and 2 deletions
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6
lib/sg_pool.c
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@ -102,7 +102,9 @@ EXPORT_SYMBOL_GPL(sg_free_table_chained);
*
* Description:
* Allocate and chain SGLs in an sg table. If @nents@ is larger than
* @nents_first_chunk a chained sg table will be setup.
* @nents_first_chunk a chained sg table will be setup. @first_chunk is
* ignored if nents_first_chunk <= 1 because user expects the SGL points
* non-chain SGL.
*
**/
int sg_alloc_table_chained(struct sg_table *table, int nents,
@ -121,7 +123,7 @@ int sg_alloc_table_chained(struct sg_table *table, int nents,
}
/* User supposes that the 1st SGL includes real entry */
if (nents_first_chunk == 1) {
if (nents_first_chunk <= 1) {
first_chunk = NULL;
nents_first_chunk = 0;
}