sdhci: Try to complete the last transaction if dumping

If the kernel panics while a thread is in the middle of an SDHCI
transaction, trying to dump to a dump target on the MMC would result in
a hang.  Fix this by completing the transaction first.

Reviewed by:	imp
Obtained from:	Hewlett Packard Enterprise
Differential Revision:	https://reviews.freebsd.org/D54255

This commit is contained in:

Justin Hibbits

2025-12-17 09:15:40 -05:00

parent f892c97b61

commit 1fad49baf3

1 changed files with 12 additions and 0 deletions

									
										sys/dev/sdhci/sdhci.c
									
		+12
		
												View File
												
				@@ -2183,6 +2183,18 @@ sdhci_generic_acquire_host(device_t brdev __unused, device_t reqdev)

					int err = 0;

					SDHCI_LOCK(slot);

					/*

					 * If the bus is busy at dump time, it may have stopped in the middle of

					 * a transaction.  Try to complete that transaction before continuing.

					 */

					if (slot->bus_busy && dumping) {

						SDHCI_UNLOCK(slot);

						while (slot->req != NULL) {

							sdhci_generic_intr(slot);

							DELAY(10);

						}

						return (0);

					}

					while (slot->bus_busy)

						msleep(slot, &slot->mtx, 0, "sdhciah", 0);

					slot->bus_busy++;