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[79.49.207.108]) by smtp.gmail.com with ESMTPSA id 18sm3777218wmj.19.2020.05.19.06.30.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2020 06:30:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589895051; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=hTxqq6p8ttwYFb2VujGvAIJEthYi+cSfp/DVMM8sKOM=; b=UAa9qOyjl0248K6TGcrfj3c8TEQcnk58/rhQhmvR5Y3evn+KwuLJPwkV/WWsyG6z5P17FC 8O8GFiDIW8CEFwo8bZakwWeCP3p3VlRiv6wtf/MdxqR37mQL7iVfDcztRGPhALfoS1xH7r FFv1vsp2sPq/ttJ/D99/+2nDGSBtfdQ= X-MC-Unique: vEsQNhllOhiZC0sv2BDWig-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=hTxqq6p8ttwYFb2VujGvAIJEthYi+cSfp/DVMM8sKOM=; b=Bi8fWj+hHWckvsNYVj5kJ1Zrqy2CIqbEafqCYmTSnK8jXT6FvFugle2qHZUQAaMNME FwyWYqIfQxNa8QLvmgZGPbvauDoTSaR2+M1j8nke6H7lLtunm6OvnyQOFT2p/QbfqMv8 67ot0f+oHmS7VlGuapHmAm0wc5uCALuIxv089ykLwdTJgXlR0+9Mng18OpVytLrzYgLD Nmk4/tyKZ7ax4UCPs+LprAci1cdQPaFfr7Dhc2jXQlD7tePnhuT9N/1l92gKRAWS5ElW /hJuRM9aWZmyo9BGxFpLEu/3zTbs0JMOi6FFt1giSagttnQWXRNbGHRdQlE2Znb0bis7 rXNQ== X-Gm-Message-State: AOAM5323ej+GW5CabEji7PR2JDKbUfU6LfziM66zWGOecZx523VK52AH acrvwFq/rq603/4VqjXhpXiyXOzsFWLMinovW5OPv6ojJjWKfzpJjB6jCvOzmFPC3tfJ2i7Y74U KpRz8W3AumNGNinw= X-Received: by 2002:a05:6000:10c3:: with SMTP id b3mr26494698wrx.53.1589895045232; Tue, 19 May 2020 06:30:45 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwbxyyN+DSHtc+3Y8wBM+ETMhLMJuO+Lbdxmx9n1Wlw9svCJn+4bnIYkhaU0+NbMxPr0xAd0w== X-Received: by 2002:a05:6000:10c3:: with SMTP id b3mr26494679wrx.53.1589895044929; Tue, 19 May 2020 06:30:44 -0700 (PDT) From: Stefano Garzarella To: qemu-devel@nongnu.org Subject: [PATCH] io_uring: retry io_uring_submit() if it fails with errno=EINTR Date: Tue, 19 May 2020 15:30:41 +0200 Message-Id: <20200519133041.112138-1-sgarzare@redhat.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.81; envelope-from=sgarzare@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/19 00:34:39 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org, Julia Suvorova , Max Reitz , Stefan Hajnoczi , Aarushi Mehta Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" As recently documented [1], io_uring_enter(2) syscall can return an error (errno=3DEINTR) if the operation was interrupted by a delivery of a signal before it could complete. This should happen when IORING_ENTER_GETEVENTS flag is used, for example during io_uring_submit_and_wait() or during io_uring_submit() when IORING_SETUP_IOPOLL is enabled. We shouldn't have this problem for now, but it's better to prevent it. [1] https://github.com/axboe/liburing/commit/344355ec6619de8f4e64584c973653= 0b5346e4f4 Signed-off-by: Stefano Garzarella --- block/io_uring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/io_uring.c b/block/io_uring.c index a3142ca989..9765681f7c 100644 --- a/block/io_uring.c +++ b/block/io_uring.c @@ -231,7 +231,7 @@ static int ioq_submit(LuringState *s) trace_luring_io_uring_submit(s, ret); /* Prevent infinite loop if submission is refused */ if (ret <=3D 0) { - if (ret =3D=3D -EAGAIN) { + if (ret =3D=3D -EAGAIN || ret =3D=3D -EINTR) { continue; } break; --=20 2.25.4