From 48b759f4ae02a3d5f40ce2884a34adb318a38dad Mon Sep 17 00:00:00 2001 From: Raul E Rangel Date: Mon, 29 Apr 2019 11:32:39 -0600 Subject: [PATCH] mmc: core: Verify SD bus width [ Upstream commit 9e4be8d03f50d1b25c38e2b59e73b194c130df7d ] The SD Physical Layer Spec says the following: Since the SD Memory Card shall support at least the two bus modes 1-bit or 4-bit width, then any SD Card shall set at least bits 0 and 2 (SD_BUS_WIDTH="0101"). This change verifies the card has specified a bus width. AMD SDHC Device 7806 can get into a bad state after a card disconnect where anything transferred via the DATA lines will always result in a zero filled buffer. Currently the driver will continue without error if the HC is in this condition. A block device will be created, but reading from it will result in a zero buffer. This makes it seem like the SD device has been erased, when in actuality the data is never getting copied from the DATA lines to the data buffer. SCR is the first command in the SD initialization sequence that uses the DATA lines. By checking that the response was invalid, we can abort mounting the card. Reviewed-by: Avri Altman Signed-off-by: Raul E Rangel Signed-off-by: Ulf Hansson Signed-off-by: Sasha Levin --- drivers/mmc/core/sd.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index f09148a4ab55..00ba8807dafe 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -214,6 +214,14 @@ static int mmc_decode_scr(struct mmc_card *card) if (scr->sda_spec3) scr->cmds = UNSTUFF_BITS(resp, 32, 2); + + /* SD Spec says: any SD Card shall set at least bits 0 and 2 */ + if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || + !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { + pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); + return -EINVAL; + } + return 0; } -- 2.20.1