From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [1/3] dma: tegra: avoid overflow of byte tracking From: Ben Dooks Message-Id: <20181114101342.7199-2-ben.dooks@codethink.co.uk> Date: Wed, 14 Nov 2018 10:13:40 +0000 To: dan.j.williams@intel.com, vkoul@kernel.org Cc: ldewangan@nvidia.com, dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org, digetx@gmail.com, Ben Dooks List-ID: VGhlIGRtYV9kZXNjLT5ieXRlc190cmFuc2ZlcnJlZCBjb3VudGVyIHRyYWNrcyB0aGUgbnVtYmVy IG9mIGJ5dGVzCm1vdmVkIGJ5IHRoZSBETUEgY2hhbm5lbC4gVGhpcyBpcyB0aGVuIHVzZWQgdG8g Y2FsY3VsYXRlIHRoZSBpbmZvcm1hdGlvbgpwYXNzZWQgYmFjayBpbiB0aGUgaW4gdGhlIHRlZ3Jh X2RtYV90eF9zdGF0dXMgY2FsbGJhY2ssIHdoaWNoIGlzIHVzdWFsbHkKZmluZS4KCldoZW4gdGhl IERNQSBjaGFubmVsIGlzIGNvbmZpZ3VyZWQgYXMgY29udGlub3VzLCB0aGVuIHRoZSBieXRlc190 cmFuc2ZlcnJlZApjb3VudGVyIHdpbGwgaW5jcmVhc2Ugb3ZlciB0aW1lIGFuZCBldmVudHVhbGx5 IG92ZXJmbG93IHRvIGJlY29tZSBuZWdhdGl2ZQpzbyB0aGUgcmVzaWR1ZSBjb3VudCB3aWxsIGJl Y29tZSBpbnZhbGlkIGFuZCB0aGUgQUxTQSBzb3VuZC1kbWEgY29kZSB3aWxsCnJlcG9ydCBpbnZh bGlkIGhhcmR3YXJlIHBvaW50ZXIgdmFsdWVzIHRvIHRoZSBhcHBsaWNhdGlvbi4gVGhpcyByZXN1 bHRzIGluCnNvbWUgdXNlcnMgYmVjb21pbmcgY29uZnVzZWQgYWJvdXQgdGhlIHBsYXlvdXQgcG9z aXRpb24gYW5kIHB1dHRpbmcgYXVkaW8KZGF0YSBpbiB0aGUgd3JvbmcgcGxhY2UuCgpUbyBmaXgg dGhpcyBpc3N1ZSwgYWx3YXlzIGVuc3VyZSB0aGUgYnl0ZXNfdHJhbnNmZXJyZWQgZmllbGQgaXMg bW9kdWxvIHRoZQpzaXplIG9mIHRoZSByZXF1ZXN0LiBXZSBvbmx5IGRvIHRoaXMgZm9yIHRoZSBj YXNlIG9mIHRoZSBjeWNsaWMgdHJhbnNmZXIKZG9uZSBJU1IgYXMgYW55b25lIGF0dGVtcHRpbmcg dG8gbW92ZSAyR2lCIG9mIERNQSBkYXRhIGluIG9uZSB0cmFuc2ZlcgppcyB1bmxpa2VseS4KCk5v dGUsIHdlIGRvbid0IGZpeCB0aGUgaXNzdWUgdGhhdCB3ZSBzaG91bGQgL25ldmVyLyB0cmFuc2Zl ciBhIG5lZ2F0aXZlCm51bWJlciBvZiBieXRlcyBzbyB3ZSBjb3VsZCBtYWtlIHRob3NlIGZpZWxk cyB1bnNpZ25lZC4KClJldmlld2VkLWJ5OiBEbWl0cnkgT3NpcGVua28gPGRpZ2V0eEBnbWFpbC5j b20+ClNpZ25lZC1vZmYtYnk6IEJlbiBEb29rcyA8YmVuLmRvb2tzQGNvZGV0aGluay5jby51az4K LS0tCiBkcml2ZXJzL2RtYS90ZWdyYTIwLWFwYi1kbWEuYyB8IDUgKysrKy0KIDEgZmlsZSBjaGFu Z2VkLCA0IGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkKCmRpZmYgLS1naXQgYS9kcml2ZXJz L2RtYS90ZWdyYTIwLWFwYi1kbWEuYyBiL2RyaXZlcnMvZG1hL3RlZ3JhMjAtYXBiLWRtYS5jCmlu ZGV4IDlhNTU4ZTMwYzQ2MS4uODIxOWFiODhhNTA3IDEwMDY0NAotLS0gYS9kcml2ZXJzL2RtYS90 ZWdyYTIwLWFwYi1kbWEuYworKysgYi9kcml2ZXJzL2RtYS90ZWdyYTIwLWFwYi1kbWEuYwpAQCAt NjM2LDcgKzYzNiwxMCBAQCBzdGF0aWMgdm9pZCBoYW5kbGVfY29udF9zbmdsX2N5Y2xlX2RtYV9k b25lKHN0cnVjdCB0ZWdyYV9kbWFfY2hhbm5lbCAqdGRjLAogCiAJc2dyZXEgPSBsaXN0X2ZpcnN0 X2VudHJ5KCZ0ZGMtPnBlbmRpbmdfc2dfcmVxLCB0eXBlb2YoKnNncmVxKSwgbm9kZSk7CiAJZG1h X2Rlc2MgPSBzZ3JlcS0+ZG1hX2Rlc2M7Ci0JZG1hX2Rlc2MtPmJ5dGVzX3RyYW5zZmVycmVkICs9 IHNncmVxLT5yZXFfbGVuOworCS8qIGlmIHdlIGRtYSBmb3IgbG9uZyBlbm91Z2ggdGhlIHRyYW5z ZmVyIGNvdW50IHdpbGwgd3JhcCAqLworCWRtYV9kZXNjLT5ieXRlc190cmFuc2ZlcnJlZCA9CisJ CShkbWFfZGVzYy0+Ynl0ZXNfdHJhbnNmZXJyZWQgKyBzZ3JlcS0+cmVxX2xlbikgJQorCQlkbWFf ZGVzYy0+Ynl0ZXNfcmVxdWVzdGVkOwogCiAJLyogQ2FsbGJhY2sgbmVlZCB0byBiZSBjYWxsICov CiAJaWYgKCFkbWFfZGVzYy0+Y2JfY291bnQpCg==