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Wed, 20 Apr 2022 05:21:45 -0700 (PDT) From: Zheyu Ma To: s.shtylyov@omp.ru, damien.lemoal@opensource.wdc.com Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, Zheyu Ma Subject: [PATCH] ata: pata_marvell: Check the 'bmdma_addr' beforing reading Date: Wed, 20 Apr 2022 20:21:34 +0800 Message-Id: <20220420122134.430997-1-zheyuma97@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RDNS_NONE, SPF_HELO_NONE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Before detecting the cable type on the dma bar, the driver should check whether the 'bmdma_addr' is zero, which means the adapter does not support DMA, otherwise we will get the following error: [ 5.146634] Bad IO access at port 0x1 (return inb(port)) [ 5.147206] WARNING: CPU: 2 PID: 303 at lib/iomap.c:44 ioread8+0x4a/0x60 [ 5.150856] RIP: 0010:ioread8+0x4a/0x60 [ 5.160238] Call Trace: [ 5.160470] [ 5.160674] marvell_cable_detect+0x6e/0xc0 [pata_marvell] [ 5.161728] ata_eh_recover+0x3520/0x6cc0 [ 5.168075] ata_do_eh+0x49/0x3c0 Signed-off-by: Zheyu Ma --- drivers/ata/pata_marvell.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/ata/pata_marvell.c b/drivers/ata/pata_marvell.c index 0c5a51970fbf..d2922699be5e 100644 --- a/drivers/ata/pata_marvell.c +++ b/drivers/ata/pata_marvell.c @@ -77,7 +77,9 @@ static int marvell_cable_detect(struct ata_port *ap) switch(ap->port_no) { case 0: - if (ioread8(ap->ioaddr.bmdma_addr + 1) & 1) + if (!ap->ioaddr.bmdma_addr) + return ATA_CBL_PATA_UNK; + else if (ioread8(ap->ioaddr.bmdma_addr + 1) & 1) return ATA_CBL_PATA40; return ATA_CBL_PATA80; case 1: /* Legacy SATA port */ -- 2.25.1