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net: ena: PHC: Add missing barrier

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Add dma_rmb() barrier after req_id completion check in
ena_com_phc_get_timestamp(). On weakly-ordered architectures,
payload fields may be read before req_id is observed as updated.

Fixes: e0ea34158e ("net: ena: Add PHC support in the ENA driver")
Closes: https://sashiko.dev/#/patchset/20260430032507.11586-1-akiyano%40amazon.com
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Arthur Kiyanovski 2026-06-04 08:07:04 +00:00 committed by Jakub Kicinski
parent f9f25118fa
commit 954981dbbf
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/amazon/ena/ena_com.c
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@ -1880,6 +1880,11 @@ int ena_com_phc_get_timestamp(struct ena_com_dev *ena_dev, u64 *timestamp)
continue;
}
/* Ensure PHC payload (timestamp, error_flags) is read
* after req_id update is observed
*/
dma_rmb();
/* req_id was updated by the device which indicates that
* PHC timestamp and error_flags are updated too,
* checking errors before retrieving timestamp