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nvme-pci: Print invalid SGL only once

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The WARN_ONCE macro returns true if the condition is true, not if the
warn was raised, so we're printing the scatter list every time it's
invalid. This is excessive and makes debugging harder, so this patch
prints it just once.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2017-09-15 13:05:38 -04:00 committed by Jens Axboe
parent 161b8be2bd
commit d087747384
1 changed files with 18 additions and 12 deletions
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30
drivers/nvme/host/pci.c
View file

@ -24,6 +24,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/once.h>
#include <linux/pci.h>
#include <linux/poison.h>
#include <linux/t10-pi.h>
@ -540,6 +541,20 @@ static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi)
}
#endif
static void nvme_print_sgl(struct scatterlist *sgl, int nents)
{
int i;
struct scatterlist *sg;
for_each_sg(sgl, sg, nents, i) {
dma_addr_t phys = sg_phys(sg);
pr_warn("sg[%d] phys_addr:%pad offset:%d length:%d "
"dma_address:%pad dma_length:%d\n",
i, &phys, sg->offset, sg->length, &sg_dma_address(sg),
sg_dma_len(sg));
}
}
static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
@ -622,19 +637,10 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req)
return BLK_STS_OK;
bad_sgl:
if (WARN_ONCE(1, "Invalid SGL for payload:%d nents:%d\n",
blk_rq_payload_bytes(req), iod->nents)) {
for_each_sg(iod->sg, sg, iod->nents, i) {
dma_addr_t phys = sg_phys(sg);
pr_warn("sg[%d] phys_addr:%pad offset:%d length:%d "
"dma_address:%pad dma_length:%d\n", i, &phys,
sg->offset, sg->length,
&sg_dma_address(sg),
sg_dma_len(sg));
}
}
WARN(DO_ONCE(nvme_print_sgl, iod->sg, iod->nents),
"Invalid SGL for payload:%d nents:%d\n",
blk_rq_payload_bytes(req), iod->nents);
return BLK_STS_IOERR;
}
static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,