This is a note to let you know that I've just added the patch titled
mmc: rtsx_usb_sdmmc: fix incorrect last byte in R2 response
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-rtsx_usb_sdmmc-fix-incorrect-last-byte-in-r2-response.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6f67cc6fd1cf339a0f19b9d4a998ec3c0123b1b6 Mon Sep 17 00:00:00 2001
From: Roger Tseng <rogerable@xxxxxxxxxxx>
Date: Fri, 15 Aug 2014 14:06:01 +0800
Subject: mmc: rtsx_usb_sdmmc: fix incorrect last byte in R2 response
From: Roger Tseng <rogerable@xxxxxxxxxxx>
commit 6f67cc6fd1cf339a0f19b9d4a998ec3c0123b1b6 upstream.
Current code erroneously fill the last byte of R2 response with an undefined
value. In addition, the controller actually 'offloads' the last byte
(CRC7, end bit) while receiving R2 response and thus it's impossible to get the
actual value. This could cause mmc stack to obtain inconsistent CID from the
same card after resume and misidentify it as a different card.
Fix by assigning dummy CRC and end bit: {7'b0, 1} = 0x1 to the last byte of R2.
Fixes: c7f6558d84af ("mmc: Add realtek USB sdmmc host driver")
Signed-off-by: Roger Tseng <rogerable@xxxxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/rtsx_usb_sdmmc.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/mmc/host/rtsx_usb_sdmmc.c
+++ b/drivers/mmc/host/rtsx_usb_sdmmc.c
@@ -435,6 +435,13 @@ static void sd_send_cmd_get_rsp(struct r
}
if (rsp_type == SD_RSP_TYPE_R2) {
+ /*
+ * The controller offloads the last byte {CRC-7, end bit 1'b1}
+ * of response type R2. Assign dummy CRC, 0, and end bit to the
+ * byte(ptr[16], goes into the LSB of resp[3] later).
+ */
+ ptr[16] = 1;
+
for (i = 0; i < 4; i++) {
cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
Patches currently in stable-queue which might be from rogerable@xxxxxxxxxxx are
queue-3.17/mmc-rtsx_pci_sdmmc-fix-incorrect-last-byte-in-r2-response.patch
queue-3.17/mmc-rtsx_usb_sdmmc-fix-incorrect-last-byte-in-r2-response.patch
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