From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZolr4dKhkcETV7ynzD6Ukav9+14CIS0NmIijb2hyPOUk5EchGjHt5BBVQxtEMTyPKmPEMpi ARC-Seal: i=1; a=rsa-sha256; t=1525116359; cv=none; d=google.com; s=arc-20160816; b=aOZzR3SbPlNqQ31xPgMtwytPPBfMvyHS/QAs6TH8vKDFOFrtFGe0xce42ktUg29CmM b3XMRhP21VhcJNR7kIZDCPw90GzSfmsYVs9E4lpYDkEse/8vd4/Jns7IajwaviwTOyVl EKZgWZwTFWR/IoZKQSG1PX8rMkTOJ03v66G+TVbEx5YeV3srPBO6MHU/lyNvJPmHAvjJ ZzBD1aIjLGxJRnpNf49xNzstWtO7Wv7nJ5SAHYySaF/IwBFLnvr9d1h4AzbYVWZmwior x0bbp6aa6jBjtnw75dB/yS3lBbKVRsGSnu9iitAvf1Xc1P1qsFsu1DhgukmNVbKgBTCT MIow== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:dmarc-filter:arc-authentication-results; bh=mCTxIxcdPDpuUA8nso5b0plFd7rQq89H2BdwGXy5AU8=; b=hCqaL0ekXxOz04T49SwSixA2pqZJlj6zNfxU2mMVR11qYbhNwddo+jbo4th/aQtq/z KWYaVhe6NoSLnANV/P7QS8sM8EHkapuC9bktzMID4BN9t34iNjqBqZ/9uCtYlbHGaUhA fRXoKxjgo5mKEqSloP+f4vEse+AAWQ55lTEh10Vbu474UIJIsmbt/2zQN0iTUjUuPxNo xJbvWtInMILfEQaxZ4HF3ihnpET2g4IAtAglTjPKydG/9vWaufoMMijQk5m9JwaW1uI4 5QMsPKSjLRfpFP0nTAg773bIF5oqS4bRGTSjgc33VUPaZXkBuO2dP2yy69PNVlGUPSCo 1eKw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of srs0=k66p=ht=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=K66P=HT=linuxfoundation.org=gregkh@kernel.org Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of srs0=k66p=ht=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=K66P=HT=linuxfoundation.org=gregkh@kernel.org DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5CFC122DAC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=fail smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Joakim Tjernlund , Richard Weinberger , Boris Brezillon Subject: [PATCH 4.4 32/44] mtd: cfi: cmdset_0002: Do not allow read/write to suspend erase block. Date: Mon, 30 Apr 2018 12:24:43 -0700 Message-Id: <20180430190947.617318706@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180430190946.093694747@linuxfoundation.org> References: <20180430190946.093694747@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1599200285170089780?= X-GMAIL-MSGID: =?utf-8?q?1599200412491871670?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Joakim Tjernlund commit 7b70eb14392a7cf505f9b358d06c33b5af73d1e7 upstream. Currently it is possible to read and/or write to suspend EB's. Writing /dev/mtdX or /dev/mtdblockX from several processes may break the flash state machine. Taken from cfi_cmdset_0001 driver. Signed-off-by: Joakim Tjernlund Cc: Reviewed-by: Richard Weinberger Signed-off-by: Boris Brezillon Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/chips/cfi_cmdset_0002.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -814,9 +814,10 @@ static int get_chip(struct map_info *map (mode == FL_WRITING && (cfip->EraseSuspend & 0x2)))) goto sleep; - /* We could check to see if we're trying to access the sector - * that is currently being erased. However, no user will try - * anything like that so we just wait for the timeout. */ + /* Do not allow suspend iff read/write to EB address */ + if ((adr & chip->in_progress_block_mask) == + chip->in_progress_block_addr) + goto sleep; /* Erase suspend */ /* It's harmless to issue the Erase-Suspend and Erase-Resume @@ -2265,6 +2266,7 @@ static int __xipram do_erase_chip(struct chip->state = FL_ERASING; chip->erase_suspended = 0; chip->in_progress_block_addr = adr; + chip->in_progress_block_mask = ~(map->size - 1); INVALIDATE_CACHE_UDELAY(map, chip, adr, map->size, @@ -2354,6 +2356,7 @@ static int __xipram do_erase_oneblock(st chip->state = FL_ERASING; chip->erase_suspended = 0; chip->in_progress_block_addr = adr; + chip->in_progress_block_mask = ~(len - 1); INVALIDATE_CACHE_UDELAY(map, chip, adr, len,