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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?aDRDa1BVdHc1MjM1UnliaU9HUXczTkRMQWpMY2phcVFZTm9vVW5jT1AxZlEy?= =?utf-8?B?WW96cm5MYU00QzhFdVdEY1ZOa0R3R0tqNnZmRkNjQ1ZnVk1ndE42SDNsOEor?= =?utf-8?B?R0tZNytwSUR1bmVST0JDYnNMNUY3RmY0TkZrS1h0V1pyN1JlbVlKUGRNbUdU?= =?utf-8?B?THB6ZzcwTlYwTG9yNkxFb0dmak50anJucjFCOFhocG1HZjZOMWxDUHdjb2xx?= =?utf-8?B?UU1DdmtWVjdMT09vdVEyNllPTzFueXl3ZnFUaWlFMFllSHBUL3IzbEI2MXVq?= =?utf-8?B?azlRVW11RmJ3bW1jWUtNdmpsOVV3aGM3R0RWaG5rV3JENUlZd2VtY3VoQi9H?= =?utf-8?B?YzRFL1V1YmtkT3N5c0d0NFMwRlNaWktSVXMrNEc0TldjMHN5UEUwbkVOZXNI?= =?utf-8?B?N3YzemRzZlZpcmM5SDRnNkZqa0k0dWY3NjZ0TnFqOXFwaklyeHQ3SW12SFNY?= =?utf-8?B?RWhUSU05b04wZDhxOUIwdXowNDlGeHB3NjFYQUZKTkdxSlc4dXJEU2pFelNK?= =?utf-8?B?K0tPVzBOcHhhbjhLMnVsRWpaRkV2TGJsa2ZoY2VKNEhpdmgvT2xhYUcrNTJX?= =?utf-8?B?MGkzWTJVN3lvb09MN21ZZmlKMkpNeWlwRUF3amh6M3Njakhmb1FHTlVaTDZv?= =?utf-8?B?Ni9QRDBJSjBEYkZZSlpzZmlESnYxbFhZOWJRMmg1cElLL3F6eVA1aDlRSTlL?= =?utf-8?B?elNoSVg0UXp0RFFGc0NHQjRKUTkyT2RwaW1CTEZwaStIZVhwU3JjamxYQXlE?= =?utf-8?B?dHJPZFlLZjhxeWNVVDJ3cDF3cG1jbHZOYmJtQnFlaUIxZVo1elVsMFpGall3?= =?utf-8?B?NVZuem4ybzJBZHdYOGFYbU9JQ0VJVVlZQUcvRWdLL2licUNORTJSNjBDakM0?= =?utf-8?B?OVRrUXJzT1lNckU5SkY4aE1IUklzWUM3UWRmSEFFazloK2s5UE9OSytLN0tt?= =?utf-8?B?alNFOVRvY0FTRUJ2bWIzNjVKa3pNRitXZFF6VmVWNitOOUNHR0wzYmxJTEN5?= =?utf-8?B?MmpBLzhKZDZrd1dlUW9DWmJFSG9nR1BINjQvSllMN2NCTDZUTTdZSitVTlZY?= =?utf-8?B?SnBlNmdNRUZUVUtLOVhHOW1tNEMxWXhsYkZTQjdPbCtXdS83UXhkTDZoYUxI?= =?utf-8?B?QjU0NXVsR3ZXTDZWRWtmeks1QXlZYWFMdUV0MWVRN1ZmbXpTcUNLZkVRMmZC?= =?utf-8?B?TzFwYnkrR21pYjEwQkRDbDB5aTJidWVDVFA1R3oycGp5ZGlNSTRCU0ZsNHZt?= =?utf-8?B?M0ZaeGh1OTdITmorTUpjMkJJQTd0cy9wTFM1ajVUMEZla1gyWXV3dkx6SXdT?= =?utf-8?Q?Of4y8hgGuRqEsaWikZYcOcGaymWxgE8uBx?= X-MS-Exchange-CrossTenant-Network-Message-Id: af7a4c56-e8a7-4d5a-ada6-08d8bbc3ecf1 X-MS-Exchange-CrossTenant-AuthSource: DS7PR03MB5608.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2021 15:15:44.3503 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: zd2OJOM8Nih2a0hTWb4Wzt4xEenI0nwfDxlugs89hSdPhLNhOyq+Pvg3aHYpodMmeQA8MvpxaWlyOf9jzluYHg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR03MB4538 X-OriginatorOrg: citrix.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Don't require the discard-alignment xenstore node to be present in order to correctly setup the feature. This can happen with versions of QEMU that only write the discard-granularity but not the discard-alignment node. Assume discard-alignment is 0 if not present. While there also fix the logic to not enable the discard feature if discard-granularity is not present. Reported-by: Arthur Borsboom Signed-off-by: Roger Pau Monné --- Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Stefano Stabellini Cc: Konrad Rzeszutek Wilk Cc: "Roger Pau Monné" Cc: Jens Axboe Cc: xen-devel@lists.xenproject.org Cc: linux-block@vger.kernel.org Cc: Arthur Borsboom --- drivers/block/xen-blkfront.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 5265975b3fba..5a93f7cc2939 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -2179,22 +2179,23 @@ static void blkfront_closing(struct blkfront_info *info) static void blkfront_setup_discard(struct blkfront_info *info) { - int err; - unsigned int discard_granularity; - unsigned int discard_alignment; + unsigned int discard_granularity = 0; + unsigned int discard_alignment = 0; + unsigned int discard_secure = 0; - info->feature_discard = 1; - err = xenbus_gather(XBT_NIL, info->xbdev->otherend, + xenbus_gather(XBT_NIL, info->xbdev->otherend, "discard-granularity", "%u", &discard_granularity, "discard-alignment", "%u", &discard_alignment, + "discard-secure", "%u", &discard_secure, NULL); - if (!err) { - info->discard_granularity = discard_granularity; - info->discard_alignment = discard_alignment; - } - info->feature_secdiscard = - !!xenbus_read_unsigned(info->xbdev->otherend, "discard-secure", - 0); + + if (!discard_granularity) + return; + + info->feature_discard = 1; + info->discard_granularity = discard_granularity; + info->discard_alignment = discard_alignment; + info->feature_secdiscard = !!discard_secure; } static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo) -- 2.29.2