From ae31bcc92bb42502bb7c9029e6dc7a824cf6cd14 Mon Sep 17 00:00:00 2001 From: Haibo Chen Date: Mon, 27 Jul 2026 18:38:49 +0800 Subject: [PATCH] mmc: sdhci: make tuning_err a signed int Coverity report INTEGER_OVERFLOW for host->tuning_err. The tuning_err field in struct sdhci_host is used to store an error code for re-tuning, but it was declared as unsigned int. Several call sites store negative error codes into it and later compare against negative values: - sdhci.c, sdhci-of-dwcmshc.c and sdhci-pci-gli.c assign it the return value of __sdhci_execute_tuning()/__sdhci_execute_tuning_9750(), both of which return a signed int (possibly a negative errno); - sdhci-of-esdhc.c assigns host->tuning_err = -EAGAIN and later does "ret = host->tuning_err; if (ret == -EAGAIN ...)"; - sdhci-of-dwcmshc.c prints it with the %d (signed) conversion. Storing a negative errno in an unsigned int and reading it back as a signed int only happens to work because of two's-complement, same-width integer conversions. It is misleading and triggers sign-conversion warnings. All users treat the value either as a signed error code or as a boolean (zero / non-zero), so changing the type to a signed int is safe and makes the intent explicit. Fixes: 7d8bb1f46e13 ("mmc: sdhci: add tuning error codes") Assisted-by: Cline:claude-sonnet [read_file, search_files, git] Signed-off-by: Haibo Chen Reviewed-by: Frank Li Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index b6a571d866fa..f0fd81409a86 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -659,7 +659,7 @@ struct sdhci_host { unsigned int tuning_count; /* Timer count for re-tuning */ unsigned int tuning_mode; /* Re-tuning mode supported by host */ - unsigned int tuning_err; /* Error code for re-tuning */ + int tuning_err; /* Error code for re-tuning */ #define SDHCI_TUNING_MODE_1 0 #define SDHCI_TUNING_MODE_2 1 #define SDHCI_TUNING_MODE_3 2