From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:42984) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RcNUq-0005HC-Ol for qemu-devel@nongnu.org; Sun, 18 Dec 2011 15:38:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RcNUp-0006yx-MJ for qemu-devel@nongnu.org; Sun, 18 Dec 2011 15:38:12 -0500 Received: from mnementh.archaic.org.uk ([81.2.115.146]:38904) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RcNUp-0006yK-C2 for qemu-devel@nongnu.org; Sun, 18 Dec 2011 15:38:11 -0500 From: Peter Maydell Date: Sun, 18 Dec 2011 20:37:51 +0000 Message-Id: <1324240680-26905-2-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1324240680-26905-1-git-send-email-peter.maydell@linaro.org> References: <1324240680-26905-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [PATCH 01/10] hw/sd.c: Fix the set of commands which are failed when card is locked List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: patches@linaro.org Fix bugs in the code determining whether to accept a card when the SD card is locked. Most notably, we had the condition completely reversed, so we would accept all the commands we should refuse and refuse all the commands we should accept. Correct this by refactoring the enormous if () clause into a separate function. We had also missed ACMD42 off the list of commands which are accepted in locked state: add it. This is one of the two problems reported in LP:597641. Signed-off-by: Peter Maydell --- hw/sd.c | 29 ++++++++++++++++++++++------- 1 files changed, 22 insertions(+), 7 deletions(-) diff --git a/hw/sd.c b/hw/sd.c index 10e26ad..a1c98c0 100644 --- a/hw/sd.c +++ b/hw/sd.c @@ -1265,6 +1265,25 @@ static sd_rsp_type_t sd_app_command(SDState *sd, return sd_r0; } +static int cmd_valid_while_locked(SDState *sd, SDRequest *req) +{ + /* Valid commands in locked state: + * basic class (0) + * lock card class (7) + * CMD16 + * implicitly, the ACMD prefix CMD55 + * ACMD41 and ACMD42 + * Anything else provokes an "illegal command" response. + */ + if (sd->card_status & APP_CMD) { + return req->cmd == 41 || req->cmd == 42; + } + if (req->cmd == 16 || req->cmd == 55) { + return 1; + } + return sd_cmd_class[req->cmd] == 0 || sd_cmd_class[req->cmd] == 7; +} + int sd_do_command(SDState *sd, SDRequest *req, uint8_t *response) { uint32_t last_status = sd->card_status; @@ -1283,17 +1302,13 @@ int sd_do_command(SDState *sd, SDRequest *req, sd->card_status &= ~CARD_STATUS_B; sd_set_status(sd); - if (last_status & CARD_IS_LOCKED) - if (((last_status & APP_CMD) && - req->cmd == 41) || - (!(last_status & APP_CMD) && - (sd_cmd_class[req->cmd] == 0 || - sd_cmd_class[req->cmd] == 7 || - req->cmd == 16 || req->cmd == 55))) { + if (last_status & CARD_IS_LOCKED) { + if (!cmd_valid_while_locked(sd, req)) { sd->card_status |= ILLEGAL_COMMAND; fprintf(stderr, "SD: Card is locked\n"); return 0; } + } if (last_status & APP_CMD) { rtype = sd_app_command(sd, *req); -- 1.7.5.4