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[hermon] Add missing write barrier after initiating reset

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Ensure that the reset register write does not get reordered behind the
first PCI configuration space read that checks to see if the reset has
completed.

Debugged-by: Jaroslav Svoboda <multi.flexi@seznam.cz>
Tested-by: Jaroslav Svoboda <multi.flexi@seznam.cz>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2026-07-10 16:29:52 +01:00
parent 58ee55b3c1
commit 84ac70ef8e
1 changed files with 1 additions and 0 deletions
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src/drivers/infiniband/hermon.c
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@@ -2843,6 +2843,7 @@ static int hermon_reset ( struct hermon *hermon ) {
pci_backup ( pci, &backup, PCI_CONFIG_BACKUP_ALL, backup_exclude );
writel ( HERMON_RESET_MAGIC,
( hermon->config + HERMON_RESET_OFFSET ) );
wmb();
/* Wait until device starts responding to configuration cycles */
for ( i = 0 ; i < HERMON_RESET_MAX_WAIT_MS ; i++ ) {