From b16e3d359b99c5771f9a22f74cbd193c7f14f895 Mon Sep 17 00:00:00 2001 From: Jonathan Bell Date: Tue, 26 Mar 2024 14:58:58 +0000 Subject: [PATCH 0997/1085] drivers: mmc: handle 1024-byte SD General Info lengths The spec allows for up to two 512-byte pages to be allocated for the Extension Register General Info block, so allocate accordingly. Signed-off-by: Jonathan Bell --- drivers/mmc/core/sd.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -1176,7 +1176,7 @@ static int mmc_sd_read_ext_regs(struct m if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT)) return 0; - gen_info_buf = kzalloc(512, GFP_KERNEL); + gen_info_buf = kzalloc(1024, GFP_KERNEL); if (!gen_info_buf) return -ENOMEM; @@ -1207,14 +1207,23 @@ static int mmc_sd_read_ext_regs(struct m num_ext = gen_info_buf[4]; /* - * We only support revision 0 and limit it to 512 bytes for simplicity. + * We only support revision 0 and up to the spec-defined maximum of 1K. * No matter what, let's return zero to allow us to continue using the * card, even if we can't support the features from the SD function * extensions registers. */ - if (rev != 0 || len > 512) { - pr_warn("%s: non-supported SD ext reg layout\n", - mmc_hostname(card->host)); + if (rev != 0 || len > 1024) { + pr_warn("%s: non-supported SD ext reg layout rev %u length %u\n", + mmc_hostname(card->host), rev, len); + goto out; + } + + /* If the General Information block spills into the next page, read the rest */ + if (len > 512) + err = mmc_sd_read_ext_reg(card, 0, 1, 0, 512, &gen_info_buf[512]); + if (err) { + pr_err("%s: error %d reading page 1 of general info of SD ext reg\n", + mmc_hostname(card->host), err); goto out; }