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Tue, 13 May 2025 17:41:37 +0800 (CST) Date: Tue, 13 May 2025 17:41:37 +0800 (CST) From: "David Wang" <00107082@163.com> To: "Mathias Nyman" Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, surenb@google.com, kent.overstreet@linux.dev Subject: Re: [RFC] USB: core/xhci: add a buffer in urb for host controller private data X-Priority: 3 X-Mailer: Coremail Webmail Server Version XT5.0.14 build 20240801(9da12a7b) Copyright (c) 2002-2025 www.mailtech.cn 163com In-Reply-To: <76b2a5ae-31b1-4627-aa59-8ff023654c3d@intel.com> References: <20250512150724.4560-1-00107082@163.com> <76b2a5ae-31b1-4627-aa59-8ff023654c3d@intel.com> X-NTES-SC: AL_Qu2fBf2Ztkoi4SadYukZnEYQheY4XMKyuPkg1YJXOp80vyTg8BgQZm9MAUHHws6uNDKhoAi0TT1A0eZkcIVZfqSsHLL8VHnwAltxxnfdVEgh Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <49a5d0b7.9095.196c9056aff.Coremail.00107082@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID:bigvCgDnD+DSEyNojXMDAA--.31721W X-CM-SenderInfo: qqqrilqqysqiywtou0bp/xtbB0hVMqmgjDQV06AADs9 X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== CgpBdCAyMDI1LTA1LTEzIDE3OjI3OjM0LCAiTWF0aGlhcyBOeW1hbiIgPG1hdGhpYXMubnltYW5A aW50ZWwuY29tPiB3cm90ZToKPkhpIERhdmlkCj4KPk9uIDEyLjUuMjAyNSAxOC4wNywgRGF2aWQg V2FuZyB3cm90ZToKPj4gLS0tCj4+IEkgd2FzIGNoZWNraW5nIG1lbW9yeSBhbGxvY2F0aW9uIGJl aGF2aW9ycyAodmlhIG1lbW9yeSBwcm9maWxpbmdbMV0pLAo+PiB3aGVuIEkgbm90aWNlIGEgaGln aCBmcmVxdWVudCBtZW1vcnkgYWxsb2NhdGlvbiBpbiB4aGNpX3VyYl9lbnF1ZXVlLCBhYm91dAo+ PiAyNTAvcyB3aGVuIHVzaW5nIGEgVVNCIHdlYmNhbS4gSWYgdGhvc2UgYWxsb2NlZCBidWZmZXIg Y291bGQgYmUga2VwdCBhbmQKPj4gcmV1c2VkLCBsb3RzIG9mIG1lbW9yeSBhbGxvY2F0aW9ucyBj b3VsZCBiZSBhdm9pZCBvdmVyIHRpbWUuCj4+IAo+PiBUaGlzIHBhdGNoIGlzIGp1c3QgYSBQT0Ms IGFib3V0IDAvcyBtZW1vcnkgYWxsb2NhdGlvbiBpbiB4aGNpIHdpdGggdGhpcwo+PiBwYXRjaCwg d2hlbiBJIHVzZSBteSBVU0IgZGV2aWNlcywgd2ViY2FtL2tleWJvYXJkL21vdXNlLgo+Cj5UaGFu a3MgZm9yIGxvb2tpbmcgYXQgdGhpcywgdGhpcyBpcyBzb21ldGhpbmcgdGhhdCBvYnZpb3VzbHkg bmVlZHMgbW9yZQo+YXR0ZW50aW9uCj4KPj4gCj4+IEEgZHluYW1pYyBjYWNoZWQgbWVtb3J5IHdv dWxkIGJlIGJldHRlcjogVVJCIGtlZXAgaG9zdCBjb250cm9sbGVyJ3MKPj4gcHJpdmF0ZSBkYXRh LCBpZiBsYXJnZXIgc2l6ZSBidWZmZXIgbmVlZGVkIGZvciBwcml2YXRlIGRhdGEsIG9sZCBidWZm ZXIKPj4gcmVsZWFzZWQgYW5kIGEgbGFyZ2VyIGJ1ZmZlciBhbGxvY2VkLgo+PiAKPj4gSSBkaWQg bm90IG9ic2VydmUgYW55IG5hZ2F0aXZlIGltcGFjdCB3aXRoIHhoY2kncyAyNTAvcyBhbGxvY2F0 aW9ucwo+PiB3aGVuIHVzaW5nIG15IHN5c3RlbSwgaGVuY2Ugbm8gbWVhc3VyZW1lbnQgb2YgaG93 IHVzZWZ1bCB0aGlzIGNoYW5nZXMKPj4gY2FuIG1ha2UgdG8gdXNlci4gSnVzdCB3YW50IHRvIGNv bGxlY3QgZmVlZGJhY2tzIGJlZm9yZSBwdXR0aW5nIG1vcmUKPj4gZWZmb3J0Lgo+PiAKPgo+SSB0 aGluayB3ZSBjYW4gbWFrZSBhIHhoY2kgaW50ZXJuYWwgc29sdXRpb24gdGhhdCBkb2Vzbid0IGFm ZmVjdCBvdGhlciBob3N0cwo+b3IgdXNiIGNvcmUuCgpZZXMsICBteSBsYXRlc3QgcGF0Y2hlcyBz ZXBhcmF0ZXMgeGhjaSBjaGFuZ2VzIGZyb20gIHVzYmNvcmUgLgo+Cj5Ib3cgYWJvdXQgYWRkaW5n IGEgbGlzdCBvZiBzdHJ1Y3QgdXJiX3ByaXYgbm9kZXMgZm9yIGV2ZXJ5IHVzYiBkZXZpY2UsIG9y IG1heWJlCj5ldmVuIHBlciBlbmRwb2ludD8gaS5lLiB0byBzdHJ1Y3QgeGhjaV92aXJ0X2Rldmlj ZSBvciAgc3RydWN0IHhoY2lfdmlydF9lcC4KPgo+QWRkIHNpemUgYW5kIGxpc3RfaGVhZCBlbnRy aWVzIHRvIHN0cnVjdCB1cmJfcHJpdi4KPgpkZXZpY2UgbGV2ZWwgbWVtcG9vbCBjb3VsZCBiZSB2 ZXJ5IGNvbXBsaWNhdGVkLCBJIHRoaW5rIGEgc2luZ2xlIG1lbW9yeSBwb29sIGhvbGQgYnkgVVJC CndvdWxkIGJlIG11Y2ggc2ltcGxlci4gKENvdWxkIHlvdSBoZWxwICB0YWtlIGEgbG9vayBhdCB0 aGlzIHBhdGNoOgpodHRwczovL2xvcmUua2VybmVsLm9yZy9sa21sLzIwMjUwNTEzMDU1NDQ3LjU2 OTYtMS0wMDEwNzA4MkAxNjMuY29tLykgCgo+SW4geGhjaV91cmJfZW5xdWV1ZSgpIHBpY2sgdGhl IGZpcnN0IHVyYl9wcml2IG5vZGUgZnJvbSBsaXN0IGlmIGl0IGV4aXN0cyBhbmQgaXMKPmxhcmdl IGVub3VnaCwgb3RoZXJ3aXNlIGp1c3QgYWxsb2NhdGUgYSBuZXcgb25lIGFuZCBzZXQgdGhlIHNp emUuCj4KPldoZW4gZ2l2aW5nIGJhY2sgdGhlIFVSQiB6ZXJvIGV2ZXJ5dGhpbmcgaW4gdGhlIHN0 cnVjdCB1cmJfcHJpdiBleGNlcHQgdGhlIHNpemUsCj5hbmQgYWRkIGl0IHRvIHRoZSBsaXN0Lgo+ Cj5XaGVuIHRoZSBkZXZpY2UgaXMgZnJlZWQgdGhlcmUgc2hvdWxkbid0IGJlIGFueSBub2RlcyBs ZWZ0IGluIHRoZSBsaXN0LCBidXQgaWYKPnRoZXJlIGFyZSB0aGVuIHdhcm4gYW5kIGZyZWUgdGhl bS4KPgo+SXNvYyB0cmFuc2ZlcnMgYXJlIHRoZSBvbmVzIHdpdGggb2RkIHVyYl9wcml2IHNpemVz LiBJZiB3ZSBoYXZlIGEgcGVyIGRldmljZSBvcgo+cGVyIGVuZHBvaW50IHVyYl9wcml2IGxpc3Qg dGhlbiBzaXplcyB3aWxsIG1hdGNoIGJldHRlci4KCklmIHRoZSBtZW1wb29sIGlzIGluIFVSQiwg dGhlbiBvbmx5IGxhcmdlc3Qgc2l6ZSBtYXR0ZXJzLCBzaW5jZSBubyB0d28gSEMgY2FuIG93biB0 aGUgVVJCCmF0IHRoZSBzYW1lIHRpbWUuCgo+Cj5UaGFua3MKPk1hdGhpYXMKPgoKVGhhbmtzIGZv ciB0aGUgY29tbWVudHMgYW5kIHN1Z2dlc3Rpb25zLgpEYXZpZA==