The Linux kernel's ata_scsi_write_same_xlat() function translates SCSI WRITE SAME commands with the UNMAP bit into ATA DATA SET MANAGEMENT TRIM commands. The TRIM descriptor was built into a 2048-byte buffer, but on devices with logical sector sizes larger than 2048 bytes (e.g., 4096 bytes for 4Kn devices), the function ata_format_dsm_trim_descr() would clamp the copy length to 2048 bytes, causing a mismatch with the expected sector size. This mismatch caused all TRIM commands to fail with a "Parameter list length error" and triggered warnings. The root cause was that the TRIM payload should be sized as a fixed 512-byte page independent of logical sector size. The fix emits exactly one 512-byte page and transfers only that page, allowing TRIM to work correctly on devices with larger sector sizes.

Devices with logical sector sizes larger than 2048 bytes were unable to successfully perform TRIM/discard operations due to the Linux kernel rejecting these commands with parameter errors. This could lead to degraded storage performance or increased wear on SSDs that rely on TRIM for efficient garbage collection. The issue did not affect devices with 512-byte sectors and did not cause data corruption but prevented proper discard functionality.

A fix is available in the Linux kernel that corrects the TRIM descriptor sizing to a fixed 512-byte page independent of logical sector size, resolving the failure of TRIM commands on devices with larger sector sizes. Users should apply the updated kernel version containing this fix to restore proper TRIM functionality. No additional mitigations are necessary once the patch is applied.