From patchwork Thu Sep 12 22:30:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 13802743 Received: from 008.lax.mailroute.net (008.lax.mailroute.net [199.89.1.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 362851C2DC5 for ; Thu, 12 Sep 2024 22:30:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=199.89.1.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726180253; cv=none; b=kqy3pLQEfk7YgYKNmY1WTtG28JEdPr/4w1GchT68P8pjmfAnlwKTzbutRY7h9h1P4GYUC5M9ZP8UDgOfMQ29pkgaLbKj77oDsje1ixHn1aHRnwsf2hycIE4emRZvgnT/IT1yOwrt32RmvkjFw72rzkWKXVyZxhB3TlOLuhbP3jQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726180253; c=relaxed/simple; bh=EItZQZqGW67M4lIKGR/iRJ2sWrG3xM+ZPKTZnbqzjkI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=N35L6Pj5ADdf7meIeoIoK2JPc8pYZTt6V+HGrKKInWPdiXRkQUU13VkMF5EG/uuMyUP4y0mNElssGY9IVO9Ul08+yCoMEmdrgejH4VM8DjFPvQlKBcbhD9Z3l7KXihlDF87IY2kOWD+ZMDm3B/i4E9Uc6EYf6jzqwZGmHzlJ0kI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org; spf=pass smtp.mailfrom=acm.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b=10DEGMer; arc=none smtp.client-ip=199.89.1.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=acm.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b="10DEGMer" Received: from localhost (localhost [127.0.0.1]) by 008.lax.mailroute.net (Postfix) with ESMTP id 4X4XG34mzkz6ClY9f; Thu, 12 Sep 2024 22:30:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=acm.org; h= content-transfer-encoding:mime-version:references:in-reply-to :x-mailer:message-id:date:date:subject:subject:from:from :received:received; s=mr01; t=1726180247; x=1728772248; bh=KjUCX +a/r76Kaz62EccFAD9fZ938Fa4JiaRnBwzRj0I=; b=10DEGMer9HkzsBil55WAb YUt9Ls0Uc7efe0RUDC9RXoWayeN3M6yTbIDuZyMC8KEvk6Le+aNr8PMDSMk3YEMK yZeTMnvAl+J2IYq3YHIdIp0CX6r0AdYPwjnVLSboc6hzO1OAKX/NBTTDmn3IkeHq URZsr3MCzP4fY3z1EpBxLtjY+C4U/NSDOYBlylIas86gbyGEuXt9MVpGW6SmZk8G 4rxT/SVCEY2KLFhaNZnBFra2M86QTLyjVsK8HGYUfAn+5gBCUcxfQMNQ1nT597Wg QBjLBLlbymo7R+uj1fMx7b4Ist2nwwh9jXwNjHF+6F05MgFMkl0TYUFtT5rRzgHR w== X-Virus-Scanned: by MailRoute Received: from 008.lax.mailroute.net ([127.0.0.1]) by localhost (008.lax [127.0.0.1]) (mroute_mailscanner, port 10029) with LMTP id 4yUXmUbTB7NZ; Thu, 12 Sep 2024 22:30:47 +0000 (UTC) Received: from bvanassche.mtv.corp.google.com (unknown [104.135.204.82]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: bvanassche@acm.org) by 008.lax.mailroute.net (Postfix) with ESMTPSA id 4X4XFy2bzTz6ClY9R; Thu, 12 Sep 2024 22:30:46 +0000 (UTC) From: Bart Van Assche To: "Martin K . Petersen" Cc: linux-scsi@vger.kernel.org, Bart Van Assche , "James E.J. Bottomley" , Peter Wang , Manivannan Sadhasivam , Avri Altman , Andrew Halaney , Bean Huo , "Bao D. Nguyen" Subject: [PATCH v4 3/4] scsi: ufs: core: Make ufshcd_uic_cmd_compl() easier to analyze Date: Thu, 12 Sep 2024 15:30:04 -0700 Message-ID: <20240912223019.3510966-4-bvanassche@acm.org> X-Mailer: git-send-email 2.46.0.662.g92d0881bb0-goog In-Reply-To: <20240912223019.3510966-1-bvanassche@acm.org> References: <20240912223019.3510966-1-bvanassche@acm.org> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In ufshcd_uic_cmd_compl(), there is code that dereferences 'cmd' with and without checking the 'cmd' pointer. This confuses static source code analyzers like Coverity and sparse. Since none of the code in ufshcd_uic_cmd_compl() can do anything useful if 'cmd' is NULL, move the 'cmd' test near the start of this function. Signed-off-by: Bart Van Assche Reviewed-by: Peter Wang Reviewed-by: Bao D. Nguyen --- drivers/ufs/core/ufshcd.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 134cba0ff512..d047ccba8b84 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -5462,10 +5462,13 @@ static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status) spin_lock(hba->host->host_lock); cmd = hba->active_uic_cmd; + if (WARN_ON_ONCE(!cmd)) + goto unlock; + if (ufshcd_is_auto_hibern8_error(hba, intr_status)) hba->errors |= (UFSHCD_UIC_HIBERN8_MASK & intr_status); - if (intr_status & UIC_COMMAND_COMPL && cmd) { + if (intr_status & UIC_COMMAND_COMPL) { cmd->argument2 |= ufshcd_get_uic_cmd_result(hba); cmd->argument3 = ufshcd_get_dme_attr_val(hba); if (!hba->uic_async_done) @@ -5482,7 +5485,10 @@ static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status) if (retval == IRQ_HANDLED) ufshcd_add_uic_command_trace(hba, cmd, UFS_CMD_COMP); + +unlock: spin_unlock(hba->host->host_lock); + return retval; }