From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B082B23D281 for ; Tue, 24 Mar 2026 19:37:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774381069; cv=none; b=GjLBO1tbiTlxMwlfRJPztigarwtxsnnLgfM6EdzXKd4wuvn6gHQGA0+yYvagU2CSVnlSp36kleXf8ajVtbx+FXVDpXnGtPRsxu675jMdFBhMTMm30u3dd3wd3sFeKTTmf7ph2BNAWkPS4+O1r0Ndb0O28b+pKSz6b7paNsndGcM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774381069; c=relaxed/simple; bh=FSMbDfBQchxcTGQjhWPZ05ODXKaW0VAxUcIbKCRCGqs=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=ONbaoB4EgmX4SnfqZvCzobw4okJJy8Y12ILzZ3qPSPwBnpTLkINBfGpVzPp7armOGd5SRwB/Tuk/QPLeGx6KeXmaxpOUU86IztX7w5RfvwZ65vOsFM94apNonjE9pY/YWeVvOoiiiLkj8FE7Zf7tL9oD3H1+ZrwTVovQKeMaPic= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mJEuEmU0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mJEuEmU0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74674C19424; Tue, 24 Mar 2026 19:37:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774381069; bh=FSMbDfBQchxcTGQjhWPZ05ODXKaW0VAxUcIbKCRCGqs=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=mJEuEmU0owy6a2jdKYB8/R9rQU8F4zXiwbP8QDPHGsOOTKVIgdHFju1XuLLaXdXGM gU30O+8h/l9fksp4pppehaocDR9Gs6i4atxEukrk2iZyv0pbnc2CoAQwdty8J8gfKr Qo9toOvHDQ3aEWsYoUer4AudPSFRRrpL1YVfqEvsgi1nHC/JvKja811h2dszHPexAO w5Y97WcTxEnQrnqPCRW+1q2639lIGViRuxE3aAm5pwhbTQh/L50cmnd2ScIThkSNFO TXfRixrw+17rDFz09P9ZnIrXwu9h9vuu4NM2hN9vcsZBXja3KYud5M8HAOBW2t0pjW ioY6iHLowdpTw== Date: Tue, 24 Mar 2026 14:37:48 -0500 From: Bjorn Helgaas To: Simon Richter Cc: linux-pci@vger.kernel.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH v3 1/5] vgaarb: pass vga_get_uninterruptible() errors to userspace Message-ID: <20260324193748.GA1149226@bhelgaas> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260307173538.763188-2-Simon.Richter@hogyros.de> On Sun, Mar 08, 2026 at 02:35:34AM +0900, Simon Richter wrote: > If VGA routing cannot be established, vga_get_uninterruptible() returns an > error and does not increment the lock count. Pass the error on, and don't > call vga_put() when userspace closes the handle. I applied this, but I'm a little confused about the "don't call vga_put() when userspace closes the handle" part. Does that happen in this patch and I'm just missing it? This patch changes the "lock" case, and the only vga_put() call I see is in the "unlock" case. > Signed-off-by: Simon Richter > --- > drivers/pci/vgaarb.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c > index d9383bf541e7..22b2b6ebdefd 100644 > --- a/drivers/pci/vgaarb.c > +++ b/drivers/pci/vgaarb.c > @@ -1134,6 +1134,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user *buf, > char kbuf[64], *curr_pos; > size_t remaining = count; > > + int err; > int ret_val; > int i; > > @@ -1165,7 +1166,11 @@ static ssize_t vga_arb_write(struct file *file, const char __user *buf, > goto done; > } > > - vga_get_uninterruptible(pdev, io_state); > + err = vga_get_uninterruptible(pdev, io_state); > + if (err) { > + ret_val = err; > + goto done; > + } > > /* Update the client's locks lists */ > for (i = 0; i < MAX_USER_CARDS; i++) { > -- > 2.47.3 >